Changes

[[Category:Work Log]]==Summer 2018== 06/11/2018 - Worked with Wei to get him set up with system ===Fall 2017===<onlyinclude> 

</onlyinclude> ===Spring 2017=== 02/02/2017 - Planned immediate next steps for LBO project; fixed bug in matching code (matchpair indices not being stored correctly) ===Fall 2016=== 09/06/2016 - Discussed workload for the week, plan for project going forward with Ed and Jake. 09/08/2016 - Reread Lerner article, compiled notes on article and state of the project 09/09/2016 - Completed some ad hoc analyses of STATA dataset to diagnose problems with propensity score matching. 10/13/2016 - Met with Ed and Brian to discuss results and future work for LBO Innovation project. Began rebuild/redocumentation of dataset. 10/14/2016 - Continuing rebuild, documentation at [[Leveraged_Buyout_Innovation_(Academic_Paper)#New_Version]]. COMPUSTAT data is now standardized for linking. 10/18/2016 - Began importing Brian's SDC data into SQL database 10/20/2016 - Completed importing SDC data 10/21/2016 - Matched SDC data to COMPUSTAT data for LBO entry flags. 10/27/2016 - Reorganized SQL script for better readability. Tried to bugfix SDC join (still WIP) 10/28/2016 - Completed initial SDC join. Adding additional matches using name-based matching. 11/03/2016 - Continued working on name-based matching. 11/04/2016 - Completed name-based matching for SDC data/LBOs. 11/10/2016 - Finalized documentation for LBO side of project. Minor bugfixes for name-based matching from last week. 11/11/2016 - Worked on matching in patent flows and stocks, basically finished up to name-based matching 11/17/2016 - Finished matching in patent flows and stocks, contingent on having a completed active patent start/end table from Napas 11/18/2016 - Minor bugfixes for STATA code (got winsorized variables working consistently); began working on patent start/end table ===Summer 2016=== 07/15/2016 11:30 - Refining hazard model: revising variables used, comparing Cox Proportional Hazard and Lognormal Accelerated Failure Time models 07/18/2016 - Cataloged SQL tables, revised STATA script (STATAdatasetup2.do) to include ratios, replace cashflow with ebitda, and filter out firms smaller than $50 million 07/19/2016 - Investigated baseline hazard of Cox Proportional Hazard model. Compared to Lognormal and Loglogistic Accelerated Failure Time models to try to predict hazard rate (not just hazard ratio) 07/20/2016 - Adjusted dataset to filter out firms that are small (<$40m) or not listed in major exchanges (AMEX, NYSE, NASDAQ). Consulted Brian on descriptive statistics of dataset. 07/21/2016 - Investigated negative ebitda ratios. 07/22/2016 - Performed further testing of hazard model. Ran preliminary matching analysis using patent flow data. 07/25/2016 - Cleaned data setup do file. Organized list of data problems to consult with Ed.

07/18/2016 3[[Category:00 - Cataloged SQL tables, revised STATA script (STATAdatasetup2.do) to include ratios, replace cashflow with ebitda, and filter out firms smaller than $50 millionWork Log]]